On Wed, Sep 20, 2017 at 10:54:15AM +0530, Keerthy wrote:
> Add shutdown handler to cleanly turn off clocks. This will help
> in cases of kexec where in a new kernel can boot abruptly.
>
> Signed-off-by: Keerthy <j-keerthy@xxxxxx>
> Acked-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Applied to pci/host-dra7xx for v4.15, thanks!
> ---
>
> Changes in v4:
>
> * Added the missing changes from v2!
>
> Changes in v3:
>
> * Pushed the function outside #ifdef CONFIG_PM_SLEEP.
> * Added more details to commit log.
>
> Changes in v2:
>
> * used a local dev pointer instead of dereferencing dev at multiple places.
> * dra7xx_pcie_stop_link before disabling clks in the shutdown path.
>
> drivers/pci/dwc/pci-dra7xx.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> index 34427a6..d084800 100644
> --- a/drivers/pci/dwc/pci-dra7xx.c
> +++ b/drivers/pci/dwc/pci-dra7xx.c
> @@ -794,6 +794,22 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
> }
> #endif
>
> +void dra7xx_pcie_shutdown(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
> + int ret;
> +
> + dra7xx_pcie_stop_link(dra7xx->pci);
> +
> + ret = pm_runtime_put_sync(dev);
> + if (ret < 0)
> + dev_dbg(dev, "pm_runtime_put_sync failed\n");
> +
> + pm_runtime_disable(dev);
> + dra7xx_pcie_disable_phy(dra7xx);
> +}
> +
> static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
> SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
> @@ -807,5 +823,6 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
> .suppress_bind_attrs = true,
> .pm = &dra7xx_pcie_pm_ops,
> },
> + .shutdown = dra7xx_pcie_shutdown,
> };
> builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
> --
> 1.9.1
>
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